There is a Epilogue Pianissimo but this main theme version is a bit rare, and I hasn't find reliable information about.

A lost the file years ago, but this weekend I lost the entire HD, got to reinstall the OS from ground zero and I'm reloading from my backup. Finally, it was iTunes time, I run it for the first time and, of course, the library was empty, because I wasn't reloaded it yet from backup... almost empty...

There was one single folder called Silent Hill! With a folder inside called Silent Hill Unreleased Tracks, with my lost file Silent Hill Pianissimo!!! How, in the name of Samael, this file is there??? That was creepy!!!